What are two main distinctions between the east Siberian greenish warbler and west warbler?

The two main distinctions between the east Siberian greenish warbler and the west warbler are:

* The Siberian greenish warbler has an all-yellow rump and tail, while the western greenish warbler has a greenish rump and tail.

* The crown and nape of the Siberian greenish warbler are gray and the upperparts are a greenish-olive, while the crown, nape, and upperparts of the western greenish warbler are all greenish-olive."